That's exactly what I mean by, "dual rear motor setup with an independent belt drive to each wheel." Two motors, two belts, two drive wheels. Sorry if I wasn't clear enough. By "function of a differential when the car makes a turn," I mean that the outer rear wheel needs to spin faster than the inner rear wheel. You need to control for that since you don't have a mechanical system to do that for you. You actually have to tell that outer wheel how much faster to spin. If not monitoring the individual wheel speed, I suppose you could look at the electrical load on each motor. You could then use feedback to balance the load between the two motors... that's essentially what an open differential does anyway. Not certain if that's the right algorithm in this case, though. If you're smart about it, you could make an effective LSD. At any rate, once you solve that control problem, seems you have half a TC system.